Science1
The atomic number of an atom is equal to the number of (protons, neutrons) in its nucleus.
protons
The nucleus of an atom is made up of neutrons and (electrons, protons).
protons
How many periods in the periodic table?
7
How many elements are naturally occurring?
88
The building blocks of matter are (atoms, compounds).
atoms
Protons are particles (outside, in) the nucleus of an atom.
in
Carbon-14 is an (isotope, element) of carbon.
isotope
Two atoms of the same element that have different (mass number, atomic numbers) are isotopes of the element?
mass numbers
Anything that takes up space and has mass in (matter, an element).
matter
Two types of properties the elements in the periodic table have?
metals; non-metals
Electrons are atomic particles with a (positive, negative) charge.
negative
(Neutrons, protons) are particles in the atom's nucleus that have no electric charge.
neutrons
Isotopes are atoms of the same element that have different numbers of (neutrons, protons).
neutrons
In atoms with equal numbers of electrons and protons, there is (a positive, no) electric charge.
no
The nucleus of an atom has a (positive, negative) charge.
positive
How many families are there in the periodic table?
18
Where are the noble gases located?
18 family
Who developed the first periodic table?
Dimitri Mendalaya
An example of matter is (air, heat).
air
A difference in the (mass number, atomic number) of atoms means the atoms are of different elements.
atomic number
What do noble gases have in common?
colorless; odorless; not radioactive
Negatively charged particles that move around the atom's nucleus are (neutrons, electrons)
electrons
The atomic particles outside of the atom's nucleus are are (electrons, protons).
electrons
Substances made up of only one kind of atom are called (isotopes, elements).
elements
What ultimately determines an elements position in the periodic table?
energy levels
Where are the alkali metals?
family 1